Stay-bolt



UNITED STATES vPATEN T OFFICE.

ROBERT J. MGKAY, OF Il?IT'IIlSB'UR-(itI-I',` PENNSYLVANIA.

STAY-BOLT.

Specification of Letters Patent.

Patented July 1, 1919.

Application led May 5` 1915.` Serial No. 26,130.-

larly to stay-bolts for uniting boiler-plates,

such as the outside shell and fire-box shell of locomotives, and to the type described and claimed in Letters Patent of the United States No. 792,863, of June 20, 1905, to George S. Thompson, the distinctive features of which being that the eye-head and eye-bolt are interlinked by their eye-loops, so as to give a certain amount of play, while at the same time independent rotary movement of the parts is prevented.

The present invention consists, generally stated, in a stay-bolt with a shank portion having an eye-loop formed at one end thereof, the eye-head comprising an eye-lloop portion having an eye-loop engaging the eyeloop of the shank, and a longitudinally divided threaded tail portion engaged by a cap or hollow nut which completes the eyehead.

yIn the accompanying drawing, Figure 1 is a view of my improved stay-bolt partly broken away; Fig. 2 is a longitudinal section; Fig. 3 is a view of the eye-loop portion of the eye-head; and Fig. 4: is a view of the manner in which the eye-loop portion of the eye-head is inserted in the eye-loop of the shank.

The numeral 2 designates the shank or bolt-portion which is provided with the loop 3 at one end and the threaded portion 4c at the opposite end.

The eye-head 5 is made up of two parts, namely, the eye-loop portion 6 and the cap or hollow-nut 7. The eye-loop portion 6 is first formed in substantially the shape shown in Fig, 3 with the semi-circular diverging tail-pieces 8 having the threads 9 formed thereon. To connect the eye-loop portion 6 up with the eye-loop 3 of the shank Q, one of the tail-portions 8 is inserted in the opening of the eye-loop 3 at right angles to the axial line of the shank, whereupon the eye-loop portion 6 is turned around to the position indicated in dotted lines Fig. 2. Pressure 1s then app-lied to the tail-portions 8 of the eye-bolt portion 6 to force said tailportions into contact, as indicated inFig. 2.

`It should be mentioned that the eye-loop portion 6 is heated sufficiently to permit of this pressing` of the tail-portions 8 into contact so that thecap 7 with the internal threads` 10 may be screwed onto the threaded portion 9 ofthe tail-portion 8. The threads 10 form projections on the tail piece, and 'any kind of a projection other than threads might be employed to form an ini terlocking connection between the cap and the tail piece.

The closing of the tail-portions 8 of the eye-loop portion 6 in the manner above described, closes up the opening 1l of the eyeloop portion 6, so that said opening conforms practically to the cross section of the eye-loop 3 of the shank 2 taken along the line a-a, Fig. 4.

To bring the tail-pieces 8 of the eye-loop portion 6 into contact, the eye-loop portion 6 is not heated to a welding heat and consequently the opening 1l can be made to fit quite accurately the eye-loop 3 at a-a, so that there is practically no longitudinal movement between the shank 2 and the eyehead, but at the same time there is no binding so as to interfere with the play at this point between the eye-head and the shank. Both the eye-head and the shank are free to move laterally and perpendicularly, the one with relation to the other, so as to take care of the uneven expansion and contraction between the boiler sheets, and so relieve the strain. As stated above, when the axial line of the eye-head and the shank are in alinement, there is practically no longitudinal movement, the one with reference to the other, due to the close fit of the opening 11 in the eye-head and the eye-loop of the shank at a-a, but this opening being larger than the links of the eye-loop 3 at opposite sides of the line a-a, suiiicient clearance is given to allow for the free lateral movement of the eye-head or shank with reference to each other.

The eye-loop portion 6 of the eye-head has the lugs 12 formed thereon, which form bearing points giving freer movement than would be permitted were the eye-loop portion to fit snugly within; the opening; loop of the shank.

The cap 7 is provided With the wrenchseat 13 for screwing the stay-bolt into position.

By my invention I forni my stay-bolt Without the necessity of Welding any of the parts, Which Welding sometimes acts to distort the parts in such a Way as to canse them to bind, but by simply forcing the shank portions 8 into contact and thenapplying the cap 7, I get a very strong construction Without resorting' to Welding'.

What I claim is:

1. A stay-bolt comprising' a shank having a loop, an eye-head having an eye-loop engaging the loop of said shank, said eyehead comprising an eye-loop portion formed with a longitudinally divided tail-piece, and a cap inclosing` said tail-piece..

2. A. stay-bolt comprising a shank having a loop, an eye-head having' a loop en gaging' thel loop of said shank, said eyehead consisting or' an eye-loop portion formed With a longitudinally-divided tailpiece, a projection on said tail-piece, and a cap inelosing' said tail-piece and forming an intereloeking' connection with said projeetion.

3. A stay-bolt comprising a shank having' a loop, an eye-head having a loop engaging the loop of said shank, said eye-head consisting' of an eye-loop portion 'having a longitudinally divid-ed tail-piece having' threads thereon, and an externally threaded cap engaging the threads of said tailfpiece.

4. A stay-bolt comprising a shank having' a loop, an eye-head having a loop engaging' the loop of said shank, and the oye-loop portion of said head having guide-lugs thereon adapted to engage the inner faces of the loop of said shank.

In testimony vvhereotl I, the said Ronm' J. MGKAY, have hereunto set iny hand..

ROBERT J. MCKAY.

Witnesses:

RoB'r. D. TOTTEN, JOHN F. WILL.

Copies of this patent may be obtained forrve cents each, by addressing the VCommissioner of Patents,

' Washington, D. C. 

